Device for cleaning sand and gravel screens.



n. NULL. DEVICE FOR CCEANING SAND AND GRAVEL-SCREENS.

APPLICATION FILED AUG-23, 19M.

Patented Jan. 23,1917.

ROSE E. NOLL, OF MARIETTA, OHIO.

DEVICE FOR CLEANING SAND AND GRAVEL SCREENS.

Specification of Letters Patent.

Applicationfiled August 23, 1916. Serial No. 116,527.

To all whom it may concern Be it known that I, RosE E. Now, a citizen of the United States, residing at Marietta, in the county of Washington and State of Ohio, have invented certain new and useful Improvements in Devices for Cleaning Sand and Gravel Screens, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to an improved device for cleaning sand and gravel screens and has for its primary object to provide very simple and eflective means for dislodging the particles of sand from the mesh of a revolving screen during the operation thereof.

It is another object of the invention to provide a device for the above purpose which is so constructed and mounted that it will effectively engage all portions of the screening surface, notwithstanding a change in its contour resulting from the great weight of the sand and gravel.

g It is another and more particular object of the invention to provide a device of the above character embodying a vertically swinging support, and a plurality of relatively short, toothed or spurred rollers carried by said support and loosely mounted for angular movement relative to their rotative axis, whereby said rollers will independently remain in effective operative engagement upon the screening surface.

With the above and other objects in view, my invention consists in the novel features of construction, combination and arrangement of parts to be hereinafter more fully described, claimed and illustrated in the accompanying drawing, in which,

Figure 1 is a side elevation of my improved screen cleaning device; Fig.- 2 is .a top plan view thereof; and Fig. 3 is an enlarged transverse section taken on the line 2-2 of Fig. 2.

Referring in detail to the drawing, 5 designates a suitable supporting frame in which the shaft 6 of a revolving screen 7 is suitably mounted. Power is transmitted to this shaft from an engine or other suitable source. The screen 7 includes end frames 8 upon which the screening fabric 9 of proper mesh is suitably secured. It is usually quite a difficult matter to keep the mesh of the screen free from fine particles of sand and prevent the same from clogging or filling up so that the sand will sift'fre'ely therethrough. operation of the machine must, therefore, be stopped and the screen fabric beaten or pounded to remove the fine sand and gravel from the mesh thereof.

It is the purpose of the present invention to provide very simple and reliable means for automatically maintaining the screening fabric free from sand and gravel. To this end, I provide aswinging frame consisting of end rods or pipes 10 which are loosely mounted at one of their ends upon a supporting rod 11 fixed in the main frame 5. A rod 12 connects the other ends of the pipes 10, and upon this rod a plurality of short rollers 13 are mounted. The end walls of these rollersare provided with relatively large openings 14 so that they may shift or move angularly with respect to Patented Jan. 23, 1917 At frequent intervals, the

each other and with respect to their common rotative axis 12. Each of these rollers 13 is provided with a multiplicity of radially projecting teeth or spurs 15 in its periphery which engage upon the wire mesh fabric 9 of the revolving screen. Suitable spacing plates or washers 16 are arranged upon the rod or axis 12 between the several rollers 13.

The operation of the device as above described will be manifest. As the screen 7 is revolved, the rollers 13, by reason of the contact of the teeth 15 thereon, will be revolved independently and in a relatively opposite direction with respect to the screen, and as the teeth 15 engage in the spaces of the wire fabric, the particles of sand and gravel will be dislodged therefrom. It frequently happens that the great weight of the sand and gravel will cause the screen fabric to sag at its center, andit will therefore be apparent that if a single cleaning roller extending the entire length of the screen were employed, it would only contact with the screen at spaced portions thereof. By the provision of a series of short rollers, however, it is seen that construction and may obviously be produced at small manufacturmg cost. While I have shown and described the preferred construction and arrangement of the several elements, it is to be understood that the device is susceptible of considerable modification therein and I, therefore, reserve the privilege of adopting all such legitimate changes as may be fairly embodied within the spirit and scope of the invention as claimed.

Having thus fully described my invention, what I desire to claim and secure by, Letters Patent is 1. The combination with a revolving sand and gravel screen having a flexible, reticu- 4 lated Wall, of a plurality of relatively r0- tatable rollers mounted above the screen for independent angular movement with respect to their rotative axes, each of said rollers having peripheral teeth for engagement through the interstices of the screen, Whereby the rollers are positively rotated in the rotation of the screen.

2. The combination with a revolving sand and gravel screen having a flexible, reticulated wall, of a vertically swinging support mounted above the screen, and a plurality of rollers mounted in spaced relation in the support for independent rotation upon. a common axis, said rollers resting upon the screen and having relative angular movement with respect to their rotative axes, the wall of the screen flexing under the weight of the rollers, each roller having peripheral teeth for engagement through the interstices in the screen, whereby the individual rollers are positively rotated. y

,In testimony whereof I hereunto affix my signature in the presence of two Witnesses.

ROSE E. NOLL. Witnesses:

R. M. NoLL, L. A. NOLL. 

